Juglandaceae, las Juglandáceas, son una familia del orden Fagales. Agrupa unos 8 géneros de árboles caducifolios, monoicos, resinosos y olorosos, en total, unas 50 especies, la mayoría de regiones templadas del hemisferio norte.

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The Juglandaceae are a family, known as the walnut family, of trees, or sometimes shrubs, in the order Fagales. Various members of this family are native to the Americas, Eurasia, and Southeast Asia.Members of the walnut family have large, aromatic leaves that are usually alternate, but opposite in Alfaroa and Oreomunnea. The leaves are pinnately compound or ternate, and usually 20–100 cm long. The trees are wind-pollinated, and the flowers are usually arranged in catkins. The nine or ten genera in the family have a total of ca 50 species, and include the commercially important nut-producing trees walnut (Juglans), pecan (Carya illinoinensis), and hickory (Carya). The Persian walnut, Juglans regia, is one of the major nut crops of the world. Walnut, hickory, and gaulin are also valuable timber trees.

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